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All of the GPU commands sent to a VkQueue will start in order, but will not end in order. The GPU is free to schedule and reorganize the commands in whatever way it sees fit. This means that if we run a shader like above, and then try to do some rendering that uses said matrix buffer, it’s possible that the compute shader hasnt finished executing before the buffer is used, thus doing a data race and likely causing bad things to happen.

barrier also used in transition image layout and queue family ownership transfer

resources:

fiber & jobsystem

https://www.gdcvault.com/play/1012321/Task-based-Multithreading-How-to
https://gdcvault.com/play/1022186/Parallelizing-the-Naughty-Dog-Engine

impl

https://codereview.stackexchange.com/questions/158739/task-based-multithreading-library-implemented-using-fibers
https://github.com/RichieSams/FiberTaskingLib
https://wickedengine.net/2018/11/24/simple-job-system-using-standard-c/

To support multiple graphics api, DirectX/OpenGL/Vulkan, we can have a wrapper of api instructions and don't expose them to user.
ex:
use a function draw() to wrap glDrawArrays, DrawInstanced and vkCmdDrawIndexed.

in vulkan

https://github.com/SaschaWillems/Vulkan/tree/master/examples/offscreen

https://github.com/SaschaWillems/Vulkan/tree/master/examples/computeheadless

and directx 12?
...

https://github.com/ocornut/imgui

release vulkan resources

• physical light source
• physically based material and shading algorithm
• physical camera

https://github.com/include-what-you-use

use tinygltf load gltf scene.

descriptorSetMap
pipelineMap

write code and push to develop branch, only create pull request if there are big changes.

replace vcpkg with 3rd party lib files.

queue family index is different in different gpu, current logic assum graphics = 0, compute = 1, transfer = 2

now commented the log

• camera class
• process user input

need a script to check code fromat

• clang-format script before commit(https://stackoverflow.com/questions/55965712/how-do-i-add-clang-formatting-to-pre-commit-hook)
• #57

provide some built-in functions for convenient usage.

branch refractor tracks the progress

main parts of this work

• Support Vulkan & DirectX12

• Multithread Rendering
  #54

• Shader & Descriptors
  #19
  #31

• Fixed Pipeline -> Render Graph
  #55

• GPU Driven Rendering
  #56

engine structure

• runtime
  • core
    • log
    • math
    • utils
    • path
  • function
    • render
    • input manager
    • window
  • scene
    • light
    • camera
    • material
    • mesh
    • scene
• application
  • main

support physically based shading
multiple light types

https://vulkan-tutorial.com/Drawing_a_triangle/Setup/Base_code

setup vulkan base code

the procedure of using a descriptor set is as follows
create descriptor pool -> allocate descriptor set -> update descriptor set -> bind descriptorset

we have some great blogs describing the descriptorset management

• https://arm-software.github.io/vulkan_best_practice_for_mobile_developers/samples/performance/descriptor_management/descriptor_management_tutorial.html
• https://ruby0x1.github.io/machinery_blog_archive/post/vulkan-descriptor-sets-management/index.html
• https://ruby0x1.github.io/machinery_blog_archive/post/efficient-binding-of-shader-resources/
• https://github.com/Themaister/Granite-MicroSamples/blob/master/05_descriptor_sets_and_binding_model.cpp

some ref:

• Real Time Rendering of Atmospheric Scattering Effects for Flight Simulators, Ralf Stokholm Nielsen.
• SIG19 Creating the Atmospheric World of Red Dead Redemption 2 A Complete and Integrated Solution, Advances in Real-Time Rendering in 3D Graphics and Games – SIGGRPAH 2019
• Lighting Research at Bungie, Hao Chen, Natalya Tatarchuk, Advances in Real-Time Rendering in 3D Graphics and Games, Siggraph 2009.
• Precomputed Atmospheric Scattering. Bruneton, E. and Neyret, F. EGSR 2008. Computer Graphics Forum.
• Real-Time Volumetric Rendering, By Patapom / Bomb! (spring 2013, course notes for the Revision Demo Party)
• Real Time Volumetric Cloudscapes of Horizon Zero Dawn, ADVANCES IN REAL-TIME RENDERING 2015
• Real-Time Samurai Cinema Lighting,Atmosphere,andTonemapping in GHOST, SIGGRAPH 2021 ADVANCES IN REAL-TIME RENDERING IN GAMES course.
• A Scalable and Production Ready Sky and Atmosphere Rendering Technique, EPIC GAMES

ref:
https://www.saschawillems.de/blog/2019/03/29/flipping-the-vulkan-viewport/
https://zhuanlan.zhihu.com/p/339295068

https://vulkan-tutorial.com/Drawing_a_triangle/Drawing/Framebuffers

prevent depth fighting
https://nlguillemot.wordpress.com/2016/12/07/reversed-z-in-opengl/
https://www.danielecarbone.com/reverse-depth-buffer-in-opengl/#:~:text=Reverse%20z%3A%20Why%20and%20How%20The%20main%20idea,loss%20of%20precision%20from%20the%20non%20linear%20z.
https://developer.nvidia.com/content/depth-precision-visualized

https://vulkan-tutorial.com/Drawing_a_triangle/Graphics_pipeline_basics/Introduction

ref:
https://github.com/v4vendeta/horizon/tree/main/docs

https://vulkan-tutorial.com/Drawing_a_triangle/Presentation/Window_surface

some examples
https://web.engr.oregonstate.edu/~mjb/vulkan/Handouts/PushConstants.1pp.pdf
https://vkguide.dev/docs/chapter-3/push_constants/
https://github.com/SaschaWillems/Vulkan/blob/master/examples/pushconstants/pushconstants.cpp

to use a frequency based resources binding model. shader writer don't care about binding slot, we decide to use a custom shading language HSL, HSL is a modified version of FSL, HSL unify the binding model of directx12 and vulkan.

after modifed the scattering pipeline, atmosphere show up in two side

implement shadow algorithms

abstract rendering related resources to RenderContext

TODO:

• ShaderCompiler based on directx-dxc
• incremental compile
• Multithread Shader Compile, PSO gen
• PSO cache

maybe?

model matrix
user input are flipped

• auto exposure
• tone mapping
• color grading
• ...